CN104330615B - The how identical survey devices and methods therefor of arrester and transformer based on fft algorithm - Google Patents
The how identical survey devices and methods therefor of arrester and transformer based on fft algorithm Download PDFInfo
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- CN104330615B CN104330615B CN201410603119.8A CN201410603119A CN104330615B CN 104330615 B CN104330615 B CN 104330615B CN 201410603119 A CN201410603119 A CN 201410603119A CN 104330615 B CN104330615 B CN 104330615B
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Abstract
The invention discloses the how identical survey devices and methods therefors of a kind of arrester based on fft algorithm and transformer, including comparison circuit, the identical test circuit of four structures, analysis and Control module, wireless module；Wherein comparison circuit includes optical coupling isolation circuit, Zero-cross comparator circuit, one end of the optical coupling isolation circuit is connected with the phase in power transmission line A, B, C three-phase, the other end of optical coupling isolation circuit is connected with the input terminal of Zero-cross comparator circuit, and the other end of the Zero-cross comparator circuit is connected with analysis and Control module；The present invention monitors when identical with N to the total current of the three-phase of A phase, B phase, C phase, while obtained total current is based on Fourier and is converted to obtain current in resistance property, and analysis current in resistance property excludes the interference of capacity current, increases the sensitivity of detection；The operating status of on-line real time monitoring arrester and transformer reduces unplanned power failure and interruption of service；Maintenance expense is reduced, the initial failure signal of arrester and transformer, continuous tracking failure evolution process in real time are monitored.
Description
Technical field
The invention discloses the how identical survey devices and methods therefor of a kind of arrester based on fft algorithm and transformer, tools
Body is related to arrester monitoring technical field.
Background technique
Arrester is one of important equipment of electric system, and the effect of arrester is for protecting various electricity in electric system
Device equipment is impacted from lightning surge, switching overvoltage, Frequency Transient Overvoltage and an electric appliance of damage.The class of arrester
Type mainly has portable protective gaps, valve-type arrester and Zinc-Oxide Arrester.Portable protective gaps are mainly used for limiting atmospheric over-voltage, generally
It is protected for distribution system, route and inlet wire of substation section.Valve-type arrester and Zinc-Oxide Arrester are used for electric substation and power generation
The protection of factory is mainly used for limiting atmospheric over-voltage in 500KV and following system, will also be used to limit in extra high voltage system interior
Overvoltage or the back-up protection for making interior overvoltage.
With arrester put into operation the time growth with and products thereof existing for defect, arrester is under working voltage
Dampness, problem of aging become increasingly conspicuous.In order to find the hidden danger of arrester in time, needs to monitor its operation conditions on-line, need
The total current for monitoring arrester and transformer, is monitored the built-in electrical insulation situation of arrester and transformer, to send out in time
The working condition of existing transformer and arrester, currently, being on-line monitoring to the main means of arrester state on_line monitoring, at present
Detection technique can not achieve three-phase current voltage while detecting, so that the work of arrester can not be directly observed in the same time
Make situation, in addition existing lightning arrester monitoring device needs operator to be read out to scene all without remote transmission function,
It to waste time and energy, while cannot intuitively be checked, efficient data can not be carried out checking analysis, effectively
Prediction Leakage Current the case where, cannot effectively improve working efficiency.
The Zinc-Oxide Arrester operated normally is crossed by capacity current and current in resistance property, due to zinc oxide fine particles spacing very
Small, equivalent capacity is larger, and therefore, capacity current accounts for main component in total current；After Zinc-Oxide Arrester is because of dampness or aging,
Mainly current in resistance property changes and (normally behaves as leakage to increase), if only detecting total current, the small change of current in resistance property
Change will be buried in oblivion by much bigger capacitive point stream, and the sensitivity of detection is very low, tend not to the defect and failure of discovery early stage,.
These problems are all current problems in urgent need to solve.
Summary of the invention
The technical problems to be solved by the present invention are: in view of the drawbacks of the prior art, providing a kind of keeping away based on fft algorithm
The how identical survey devices and methods therefor of thunder device and transformer monitors when identical with N to the total current of A, B, C three-phase, while will
To total current be based on Fourier and converted to obtain current in resistance property, analysis current in resistance property excludes the interference of capacity current, makes to examine
The sensitivity of survey increases；The operating status of on-line real time monitoring arrester and transformer reduces unplanned power failure and interruption of service,
Working efficiency is improved, the labor intensity of staff is mitigated；Maintenance expense is reduced, periodic inspection time interval is extended, monitoring is kept away
The initial failure signal of thunder device and transformer, continuous tracking failure evolution process, science in real time dynamically adjust load.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of how identical survey device of arrester and transformer based on fft algorithm, including comparison circuit, four structure phases
Test circuit together, analysis and Control module, wireless module；
Wherein comparison circuit includes optical coupling isolation circuit, Zero-cross comparator circuit, one end of the optical coupling isolation circuit with it is defeated
A phase in electric wire A, B, C three-phase is connected, and the other end of optical coupling isolation circuit is connected with the input terminal of Zero-cross comparator circuit, described
The other end of Zero-cross comparator circuit is connected with analysis and Control module；
Test circuit includes zinc oxide MOV leakage of current circuit, mutual inductor, current-to-voltage converting circuit, filter circuit, puts
Big device, wherein one of the one end in the zinc oxide MOV leakage of current circuit and four power transmission lines is connected, the zinc oxide MOV
The other end in leakage of current circuit and the winding of mutual inductor mutually incude, the output end of mutual inductor and current-to-voltage converting circuit it is defeated
Enter end be connected, the output end of the current-to-voltage converting circuit is connected with the input terminal of filter circuit, the filter circuit it is defeated
Outlet is connected with the input terminal of the amplifier, and the output end of the amplifier is connected with analysis and Control module；
The analysis and Control module is also connected with wireless module；
As a further optimization solution of the present invention, the filter circuit uses RC filter circuit.
As a further optimization solution of the present invention, the Zero-cross comparator circuit, using low-power consumption amplifier mode to power frequency
Mains frequency carries out zero-crossing examination.
As a further optimization solution of the present invention, the analysis and Control module uses MCU controller, and MCU controller is
STM32L single-chip microcontroller.
As a further optimization solution of the present invention, the wireless module transmits chip using SI4432 small wireless.
As a further optimization solution of the present invention, the amplifier is three-level gain adjustable amplifier.
As a further optimization solution of the present invention, the mutual inductor is punch current transfomer.
As a further optimization solution of the present invention, the current-to-voltage converting circuit is amplified using low-power consumption integrated computation
Device and accurate sampling resistor, constitute inverse proportion current-to-voltage converting circuit.
It as a further optimization solution of the present invention, further include temperature sensor, humidity sensor, display module, GPS mould
Block, checking of great current coil and current detection module, wherein temperature sensor, humidity sensor, display module, GPS module, big
Electric current detecting coil and current detection module are connected with analysis and Control module, and temperature sensor, humidity sensor will test
Temperature data, humidity data are sent to analysis and Control module, and analysis and Control module is to the temperature data and humidity data received
After being analyzed, final data are shown in display module；The longitude and latitude measured and latitude information are sent to by GPS module
Analysis and Control module, analysis and Control module will analyze resulting longitude and latitude and latitude information is shown in display module；Big electricity
The information of the electric current of the overvoltage inside arrester is flowed through in stream detection coil detection, and is sent to analysis and Control module, analysis control
Molding block obtains the peak value, wavelength and waveform of electric current by analyzing the information of electric current, and is sent by wireless module；Current detecting
The Leakage Current value on the arrester surface that module will test is sent to analysis and Control module, and analysis and Control module is let out what is obtained
Dew current value is converted into pollution degree, and is shown in display module.
A kind of how identical survey devices and methods therefor of arrester and transformer based on fft algorithm, it is characterised in that: packet
Include following steps:
Step 1: the Leakage Current of A phase, B phase, C phase and N phase enters zinc oxide MOV leakage of current circuit, and mutual inductor obtains
Leakage total current, the leakage total current in zinc oxide MOV leakage of current circuit are entered in a manner of electric current by the coupling of mutual inductor
Current-to-voltage converting circuit；
Step 2: current-to-voltage converting circuit converts electrical current into voltage, then sends filter unit for voltage, filters out
Interference signal is input to the AD sample port of analysis and Control module after wherein amplifying subsequently into amplification；
Step 3: optical coupling isolation circuit obtains the voltage of a coupled phase as the reference voltage, Zero-cross comparator circuit
The AD analog sampling module that low level triggers analysis and Control inside modules, AD analog sampling module root are exported after obtaining reference voltage
According to the total current point of the second phase in sample frequency continuous sampling three-phase A, B, C；
Step 4: resulting total current point is carried out Fourier transformation by analysis and Control module, obtains the amplitude of current first harmonics,
Then analysis and Control module adjusts the best magnification of amplifier, obtains current first harmonics according to the total current after Fourier transformation
The phase angle of signal, according to the phase order relation between three-phase electricity, phase angle successively increases 120 °, then the phase angle i.e. phase total current
With the angle a between the phase current in resistance property, according to sciagraphy, the total current of the phase is the phase multiplied by the cosine value of angle a
Current in resistance property carries out Fourier transformation to the current in resistance property and obtains triple-frequency harmonics, and return step one calculates the full electricity of third phase
Stream, current in resistance property and triple-frequency harmonics.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
First: the present invention monitors when identical with N to the total current of A, B, C three-phase, while obtained total current is based on Fu
In leaf converted to obtain current in resistance property, analysis current in resistance property excludes the interference of capacity current, increases the sensitivity of detection；
Second: the operating status of on-line real time monitoring arrester and transformer of the present invention reduces unplanned power failure and operation
Accident improves working efficiency, mitigates the labor intensity of staff；
Third: reducing maintenance expense, extends periodic inspection time interval, monitors the initial failure letter of arrester and transformer
Number, continuous tracking failure evolution process, science in real time dynamically adjust load.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
The present invention discloses the how identical survey device of a kind of arrester based on fft algorithm and transformer, system of the invention
For structural schematic diagram as shown in Figure 1, by taking A phase, B phase, C phase, N phase current as an example, the present invention includes that comparison circuit, four structures are identical
Test circuit, analysis and Control module, wireless module；
By taking A circuitry phase as an example, B phase, C phase, the circuit structure of N phase are identical as A phase, and wherein comparison circuit includes light-coupled isolation
Circuit, Zero-cross comparator circuit, according to power grid three-phase phase sequence relationship, collection uses and takes B phase as the reference voltage, the light-coupled isolation
One end of circuit is connected with B phase, and the other end of optical coupling isolation circuit is connected with the input terminal of Zero-cross comparator circuit, the zero passage ratio
The other end compared with circuit is connected with analysis and Control module；
Test circuit includes zinc oxide MOV leakage of current circuit, punching mutual inductor, I/V conversion circuit i.e. Current Voltage turn
Change circuit, RC filter circuit, three-level gain adjustable amplifier, punching mutual inductor, wherein the zinc oxide MOV leakage of current circuit
One end be connected with A phase, the winding of the other end and punching mutual inductor in the zinc oxide MOV leakage of current circuit mutually incudes, and wears
The output end of core mutual inductor is connected with the input terminal of I/V conversion circuit, the output end and RC filter circuit of the I/V conversion circuit
Input terminal be connected, the output end of the RC filter circuit is connected with the input terminal of the three-level gain adjustable amplifier, three-level
The output end of gain adjustable amplifier is connected with analysis and Control module；
Analysis and Control module is also connected with wireless module, and wireless module transmits chip, wireless mould using SI4432 small wireless
The data information measured is sent to server by block, can intuitively observe data status by server；
Zero-cross comparator circuit carries out zero-crossing examination, analysis and Control to common frequency power network frequency using low-power consumption amplifier mode
Module uses MCU controller, and MCU controller is STM32L single-chip microcontroller, and I/V conversion circuit uses low-power integrated operational amplifier
With accurate sampling resistor, inverse proportion current-to-voltage converting circuit is constituted.
Using accurate punch current transfomer coupled modes, guarantee that the circuit of three-phase lightning protector can be abutted against in the case where realizing data acquisition
Ground, the influence of device not monitored；The proportion resistor parameter for sampling metal-oxide-semiconductor control direct proportion amplifier, is realized to amplification factor tune
It is whole.
A method of the how identical survey device of arrester and transformer based on fft algorithm, it is characterised in that: including
Following steps:
Step 1: the Leakage Current of A phase, B phase, C phase and N phase enters zinc oxide MOV leakage of current circuit, punching mutual inductor
Obtain the leakage total current in zinc oxide MOV leakage of current circuit, leakage total current passes through the coupling of punching mutual inductor with electric current
Mode enters I/V conversion circuit；
Step 2: I/V conversion circuit converts electrical current into voltage, then sends RC filter unit for voltage, filters out dry
Signal is disturbed, the AD sample port of MCU controller is input to after wherein amplifying subsequently into amplification；
Step 3: optical coupling isolation circuit obtains the voltage of coupled B phase as the reference voltage, and Zero-cross comparator circuit obtains
The AD analog sampling module inside low level triggering MCU controller is exported after to reference voltage, AD analog sampling module is according to adopting
The total current point of sample frequency continuous sampling A phase；
Step 4: resulting total current point is carried out Fourier transformation by MCU controller, obtains the amplitude of current first harmonics, so
MCU controller adjusts the best magnification of three-level gain adjustable amplifier afterwards, is obtained according to the total current after Fourier transformation
The phase angle of current first harmonics signal, according to the phase order relation between three-phase electricity, phase angle successively increases 120 °, then the phase angle i.e. should
Angle a between phase total current and the phase current in resistance property, according to sciagraphy, the total current that measures is I, current in resistance property be Ir=
I*cosa carries out Fourier transformation to the current in resistance property and obtains triple-frequency harmonics, return step one, calculate A phase, C phase, N phase it is complete
Electric current, current in resistance property and triple-frequency harmonics.
The data that the device measures are sent to server by wireless module, are intuitively shown by server, user
Timely the working condition of arrester and transformer can be analyzed and determined according to data, reduce maintenance expense, extended regular
Repair time interval；According to advanced on-line analysis, the operating status of arrester and transformer is analyzed in time, and scientific management is simultaneously prolonged
The service life of long equipment；
The initial failure signal of monitoring device, and continuous real-time tracking failure has developed exhibition process；According to the reality of equipment
Operation information, scientifically dynamic Load adjustment；
It solves iron core grounding detection and real-time detection, waste of manpower money is manually unable to using clamp on amperemeter hand dipping
Source, low precision, be affected by the external environment many disadvantages such as big；
Electric power enterprise is helped to carry out comprehensive, intuitive, monitoring in real time and intelligence to transformer, core of reactor operation conditions
Analysis provides more accurate, more timely, more complete information；
It improves working efficiency, mitigate intensity of workers；It simultaneously can be transformer, reactor repair based on condition of component provides
Effective technical support；Electricity net safety stable level can be improved and ability of preventing and reducing natural disasters；
The life cycle management monitoring and management for reinforcing equipment, improve production efficiency, have extensively for building strong smart grid
General application.
The present apparatus further includes temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and electricity
Detection module is flowed, wherein temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and electric current inspection
It surveys module to be connected with analysis and Control module, temperature data that temperature sensor, humidity sensor will test, humidity data transmission
After giving analysis and Control module, analysis and Control module to analyze the temperature data and humidity data that receive, by final number
It is shown according in display module；
The longitude and latitude measured and latitude information are sent to analysis and Control module by GPS module, and analysis and Control module will analyze institute
The longitude and latitude and latitude information obtained carries out showing and being sent by wireless module in display module；User can pass through longitude and latitude
Degree information learns the position where arrester, is monitored to the working condition of arrester position.
Checking of great current Coil Detector flows through the information of the electric current of the overvoltage inside arrester, and is sent to analysis and Control
Module, analysis and Control module obtains the peak value, wavelength and waveform of electric current by analyzing the information of electric current, and is sent out by wireless module
It is sent to server, user can observe the overvoltage inside arrester, including lightning stroke voltage and behaviour by the display of server
The case where making overvoltage finds the failure of arrester in time；
The Leakage Current value on the arrester surface that current detection module will test is sent to analysis and Control module, analysis control
Obtained Leakage Current value is converted into pollution degree by molding block, and is shown in display module.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention.
It is all according to the technical idea provided by the invention and any changes made on the basis of the technical scheme, each fall within the present invention
Within protection scope.
Claims (8)
1. a kind of multiphase simultaneous test method of the how identical survey device of arrester and transformer based on fft algorithm, it is characterised in that:
Including comparison circuit, the identical test circuit of four structures, analysis and Control module, wireless module；
Wherein comparison circuit includes optical coupling isolation circuit, Zero-cross comparator circuit, one end of the optical coupling isolation circuit and power transmission line
A, the phase in B, C three-phase is connected, and the other end of optical coupling isolation circuit is connected with the input terminal of Zero-cross comparator circuit, the zero passage
The other end of comparison circuit is connected with analysis and Control module；
Testing circuit includes zinc oxide MOV leakage of current circuit, mutual inductor, current-to-voltage converting circuit, filter circuit, amplification
Device, wherein one of the one end in the zinc oxide MOV leakage of current circuit and four power transmission lines is connected, the zinc oxide MOV electricity
The winding for flowing the other end and mutual inductor in dew circuit mutually incudes, the input of the output end and current-to-voltage converting circuit of mutual inductor
End is connected, and the output end of the current-to-voltage converting circuit is connected with the input terminal of filter circuit, the output of the filter circuit
End is connected with the input terminal of the amplifier, and the output end of the amplifier is connected with analysis and Control module；
The analysis and Control module is also connected with wireless module；
The filter circuit uses RC filter circuit；
Specifically comprise the following steps:
Step 1: the Leakage Current of A phase, B phase, C phase and N phase enters zinc oxide MOV leakage of current circuit, and A, B, C, N tetra- are mutual
Sensor obtains the leakage total current in respective zinc oxide MOV leakage of current circuit respectively, leakage total current passes through the coupling of mutual inductor
Enter the I/V conversion circuit of tetra- phase of A, B, C, N in a manner of electric current；
Step 2: A, the Leakage Current of each phase is converted to voltage by the I/V conversion circuit of tetra- phase of B, C, N, then sends voltage
To filter unit, filtering interference signals, subsequently into amplifier, wherein be input to after amplifying A, B of analysis and Control module,
C, tetra- phase AD sample port of N；
Step 3: optical coupling isolation circuit obtains the voltage of coupled B phase as the reference voltage, and Zero-cross comparator circuit is joined
The AD analog sampling module that low level triggers analysis and Control inside modules is exported after examining voltage, AD analog sampling module is according to sampling
The total current point of frequency continuous sampling B phase；
Step 4: resulting total current point is carried out Fourier transformation by analysis and Control module, obtains the width of the current first harmonics of B phase
Degree, then analysis and Control module adjusts the best magnification of amplifier, obtains B phase electricity according to the total current after Fourier transformation
The phase angle for flowing fundamental signal, according to the phase order relation between three-phase electricity, the phase angle of A phase reduces 120 °, and the phase angle of C phase increases
Add 120 °, then the angle a between phase angle, that is, phase total current and the current in resistance property of phase, according to sciagraphy, the total current of phase multiplies
Cosine value with angle a is the current in resistance property of phase, carries out Fourier transformation to current in resistance property and obtains triple-frequency harmonics, thus respectively
Calculate total current, current in resistance property and the triple-frequency harmonics of A, C phase.
2. a kind of how identical survey device of arrester and transformer based on fft algorithm as described in claim 1 is how identical
Survey method, it is characterised in that: the Zero-cross comparator circuit carries out zero crossing to common frequency power network frequency using low-power consumption amplifier mode
Detection.
3. a kind of how identical survey device of arrester and transformer based on fft algorithm as claimed in claim 2 is how identical
Survey method, it is characterised in that: the analysis and Control module uses MCU controller, and MCU controller is STM32L single-chip microcontroller.
4. a kind of how identical survey device of arrester and transformer based on fft algorithm as claimed in claim 3 is how identical
Survey method, it is characterised in that: the wireless module transmits chip using SI4432 small wireless.
5. a kind of how identical survey device of arrester and transformer based on fft algorithm as claimed in claim 4 is how identical
Survey method, it is characterised in that: the amplifier is three-level gain adjustable amplifier.
6. a kind of how identical survey device of arrester and transformer based on fft algorithm as described in claim 1 is how identical
Survey method, it is characterised in that: the mutual inductor is punch current transfomer.
7. a kind of how identical survey device of arrester and transformer based on fft algorithm as claimed in claim 6 is how identical
Survey method, it is characterised in that: the current-to-voltage converting circuit uses low-power integrated operational amplifier and accurate sampling resistor,
Constitute inverse proportion current-to-voltage converting circuit.
8. a kind of how identical survey device of arrester and transformer based on fft algorithm as claimed in claim 7 is how identical
Survey method, it is characterised in that: further include temperature sensor, humidity sensor, display module, GPS module, checking of great current coil
And current detection module, wherein temperature sensor, humidity sensor, display module, GPS module, checking of great current coil and electricity
Stream detection module is connected with analysis and Control module, temperature data that temperature sensor, humidity sensor will test, humidity data
Being sent to analysis and Control module will be final after analysis and Control module analyzes the temperature data and humidity data that receive
Data shown in display module；The longitude measured and latitude information are sent to analysis and Control module by GPS module, analysis
Control module will analyze resulting longitude and latitude and latitude information is shown in display module；Checking of great current Coil Detector flows through
The information of the electric current of overvoltage inside arrester, and it is sent to analysis and Control module, analysis and Control module passes through analysis electric current
Information obtain the peak value, wavelength and waveform of electric current, and pass through wireless module and send；The arrester that current detection module will test
The Leakage Current value on surface is sent to analysis and Control module, and obtained Leakage Current value is converted into filth by analysis and Control module
Degree, and shown in display module.
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| CN105182160B (en) * | 2015-09-21 | 2018-08-31 | 厦门大恒科技有限公司 | A kind of online SPD microampere orders leak current detection device |
| CN106066437B (en) * | 2016-07-08 | 2018-11-23 | 南京信息工程大学 | A kind of on-line monitoring device of metallic oxide arrester and its monitoring method |
| CN107525996B (en) * | 2017-08-25 | 2024-04-30 | 中国电力科学研究院 | Online monitoring method and system for leakage current of voltage limiter of series compensation device |
| CN107807266A (en) * | 2017-10-31 | 2018-03-16 | 国家电网公司 | Leakage current of an arrester remote online monitoring system |
| CN108333455A (en) * | 2018-04-08 | 2018-07-27 | 广东电网有限责任公司 | Live detection device for three-phase alternating-current metal oxide arrester group |
| CN108627724A (en) * | 2018-05-14 | 2018-10-09 | 郑州思辩科技有限公司 | A kind of metal oxide arrester operating status digital monitoring system and method |
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